EP1884815A3 - Fixed-focal objective of the retrofocus type for projector - Google Patents

Fixed-focal objective of the retrofocus type for projector Download PDF

Info

Publication number
EP1884815A3
EP1884815A3 EP07011476A EP07011476A EP1884815A3 EP 1884815 A3 EP1884815 A3 EP 1884815A3 EP 07011476 A EP07011476 A EP 07011476A EP 07011476 A EP07011476 A EP 07011476A EP 1884815 A3 EP1884815 A3 EP 1884815A3
Authority
EP
European Patent Office
Prior art keywords
lens group
fixed
lens
projector
focal length
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07011476A
Other languages
German (de)
French (fr)
Other versions
EP1884815A2 (en
Inventor
Yi-Hao Kang
Chao-Yi Yeh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Young Optics Inc
Original Assignee
Young Optics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Young Optics Inc filed Critical Young Optics Inc
Publication of EP1884815A2 publication Critical patent/EP1884815A2/en
Publication of EP1884815A3 publication Critical patent/EP1884815A3/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/04—Reversed telephoto objectives
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/16—Optical objectives specially designed for the purposes specified below for use in conjunction with image converters or intensifiers, or for use with projectors, e.g. objectives for projection TV

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

A fixed-focus lens (200) for projecting an image from a light valve (60) onto a screen comprises a first lens group (210), a second lens group (220), and a third lens group (230) arranged in this sequence from the screen to the light valve. The first lens group has negative refractive power, the second lens group has positive refractive power and the third lens group has positive refractive power and comprises four lenses. The on-axis distance between the first and second lens groups is S1-2, the effective focal length of the third lens group is F3, and S1-2/F3> 1.51. The effective focal length of the lens closest to the screen in the first lens group is F11. The effective focal length of the fixed-focus lens is F, and F11/F<-18.5.
EP07011476A 2006-07-27 2007-06-12 Fixed-focal objective of the retrofocus type for projector Withdrawn EP1884815A3 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB2006101080992A CN100552487C (en) 2006-07-27 2006-07-27 Tight shot

Publications (2)

Publication Number Publication Date
EP1884815A2 EP1884815A2 (en) 2008-02-06
EP1884815A3 true EP1884815A3 (en) 2008-03-19

Family

ID=38613210

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07011476A Withdrawn EP1884815A3 (en) 2006-07-27 2007-06-12 Fixed-focal objective of the retrofocus type for projector

Country Status (2)

Country Link
EP (1) EP1884815A3 (en)
CN (1) CN100552487C (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI403755B (en) * 2008-12-24 2013-08-01 Young Optics Inc Fixed-focus lens
CN102043229B (en) * 2009-10-15 2012-05-23 扬明光学股份有限公司 Prime lens
TW201221994A (en) * 2010-11-22 2012-06-01 Ability Entpr Co Ltd Lens module
TWI416162B (en) * 2011-04-22 2013-11-21 Largan Precision Co Image taking optical system
TWI674436B (en) * 2016-05-26 2019-10-11 信泰光學（深圳）有限公司 Projection lens
JP6740873B2 (en) * 2016-11-22 2020-08-19 セイコーエプソン株式会社 Projection optical system and projector
CN107688228B (en) * 2017-11-01 2023-10-03 广东奥普特科技股份有限公司 4mm fixed focus machine vision lens
CN110456600B (en) * 2018-05-08 2021-02-02 青岛海信激光显示股份有限公司 Projection lens and laser projection device
TWI805585B (en) * 2018-05-31 2023-06-21 揚明光學股份有限公司 Zoom lens
CN114019664A (en) * 2018-06-19 2022-02-08 深圳光峰科技股份有限公司 Fixed-focus lens and imaging system
CN110221511A (en) * 2019-05-15 2019-09-10 深圳市瞐客科技有限公司 A kind of new and effective micro- projection optics framework
CN112835176B (en) * 2019-11-25 2022-07-15 上旸光学股份有限公司 High-resolution prime lens
CN111290105B (en) * 2020-02-26 2022-05-24 歌尔股份有限公司 Optical system and projection apparatus
CN114690369B (en) * 2020-12-25 2023-10-13 成都极米科技股份有限公司 Projection lens
CN113050244B (en) * 2021-03-22 2023-03-17 业成科技（成都）有限公司 Lens assembly and display device
CN114062281B (en) * 2021-11-19 2023-12-01 南京农业大学 Wide-view-angle multispectral imaging type crop growth sensing device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06138386A (en) * 1992-01-06 1994-05-20 Mitsubishi Electric Corp Retrofocus type lens and projection type display device
US6417975B1 (en) * 1998-12-28 2002-07-09 Minolta Co., Ltd. Taking lens system
US20030137744A1 (en) * 2001-06-28 2003-07-24 Minolta Co., Ltd. Projection optical system
EP1571479A2 (en) * 2004-02-24 2005-09-07 Samsung Electronics Co., Ltd. Retrofocus type projection optical system
US20050259336A1 (en) * 2004-05-19 2005-11-24 Kiwamu Kobayashi Projection lens system and projector

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06138386A (en) * 1992-01-06 1994-05-20 Mitsubishi Electric Corp Retrofocus type lens and projection type display device
US6417975B1 (en) * 1998-12-28 2002-07-09 Minolta Co., Ltd. Taking lens system
US20030137744A1 (en) * 2001-06-28 2003-07-24 Minolta Co., Ltd. Projection optical system
EP1571479A2 (en) * 2004-02-24 2005-09-07 Samsung Electronics Co., Ltd. Retrofocus type projection optical system
US20050259336A1 (en) * 2004-05-19 2005-11-24 Kiwamu Kobayashi Projection lens system and projector

Also Published As

Publication number Publication date
CN101114046A (en) 2008-01-30
CN100552487C (en) 2009-10-21
EP1884815A2 (en) 2008-02-06

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